Analysis of discretization methods applied on DC-SOGI block as part of SRF-PLL structure

Krstic, Milica Ristovic; Lubura, Slobodan; Lale, Srđan; Šoja, Milomir; Ikić, Marko; Milovanovic, D.

doi:10.1109/indel.2016.7797771

“…in Europe, the nominal frequency is f 0 = 50 Hz, therefore the initial (nominal) value should be ω 0 = 2π f 0 . As proposed in [5], the principle adaption law (11) should be extended by (i) a gain normalization (GN), (ii) a sign-correct anti-windup (AW) decision function (13) to achieve a stable and smooth(er) frequency estimation. Moreover, in view of measurement noise, additional low-pass filters (LPFs) should be included in the mFLL.…”

Section: E Frequency Adaption By Modified Fll (Mfll)mentioning

confidence: 99%

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹

2020

Preprint

0

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A unified method is presented which allows to estimate all harmonic components, DC-offset and fundamen- tal frequency in arbitrarily distorted single-phase grids us- ing a frequency-adaptive observer (FAO) consisting of modi- fied Second-Order Generalized Integrators (mSOGIs), a DC- Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of DC-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, a mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown by comparisons to existing estimation methods.

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“…,ω min ≤ δ ≤ω maẋ ω min , δ <ω min (13) to achieve a stable and smooth(er) frequency estimation. Moreover, in view of measurement noise, additional low-pass filters (LPFs) should be included in the mFLL.…”

Section: E Frequency Adaption By Modified Fll (Mfll)mentioning

confidence: 99%

“…they can reduplicate any non-distorted sinusoid (and, as side product, its quadrature signal) with known and constant frequency. For proper functionality, if the frequency is unknown or varying, the SOGIs must be equipped with a Phase Locked Loop [13], [14], [15] or a Frequency Locked Loop [6], [16], [17] to estimate the signal's frequency online.…”

mentioning

confidence: 99%

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹,

Landerer²

2020

Preprint

0

View full text Add to dashboard Cite

A unified method is presented which allows to estimate all harmonic components, DC-offset and fundamen- tal frequency in arbitrarily distorted single-phase grids us- ing a frequency-adaptive observer (FAO) consisting of modi- fied Second-Order Generalized Integrators (mSOGIs), a DC- Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of DC-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, a mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown by comparisons to existing estimation methods.

show abstract

“…they can reduplicate any non-distorted sinusoid (and, as side product, its quadrature signal) with known and constant frequency. For proper functionality, if the frequency is unknown or varying, the SOGIs must be equipped with a Phase Locked Loop (PLL) [4], [5], [15], [17], [18], [19] or a Frequency Locked Loop (FLL) [8], [16], [20], [21] to estimate the signal's frequency online.…”

mentioning

confidence: 99%

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

Hackl

¹

,

Landerer

²

2020

IEEE Open J. Ind. Electron. Soc.

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A unified method is presented which allows to estimate dc-offset, all harmonic components and fundamental frequency in arbitrarily distorted single-phase grids using a Frequency Adaptive Observer (FAO) consisting of modified Second-Order Generalized Integrators (mSOGIs), an adaptive DC-Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of dc-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, an mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown and compared to existing estimation methods. INDEX TERMS dc-offset estimation, frequency adaptive observer; frequency estimation; frequency locked loop; harmonics estimation; second-order generalized integrator.

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Analysis of discretization methods applied on DC-SOGI block as part of SRF-PLL structure

Cited by 4 publications

References 5 publications

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

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